/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.syncope.common.lib.types;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

public final class ImplementationTypesHolder {

    private static final Object MONITOR = new Object();

    private static ImplementationTypesHolder INSTANCE;

    public static ImplementationTypesHolder getInstance() {
        synchronized (MONITOR) {
            if (INSTANCE == null) {
                INSTANCE = new ImplementationTypesHolder();
            }
        }
        return INSTANCE;
    }

    private final Map<String, String> values = Collections.synchronizedMap(new HashMap<>());

    private ImplementationTypesHolder() {
        // private constructor for singleton
    }

    public void putAll(final Map<String, String> value2Class) {
        this.values.putAll(value2Class);
    }

    public Map<String, String> getValues() {
        return Collections.unmodifiableMap(values);
    }
}
